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The relationship between happiness and intelligent quotient: the contribution of socio-economic and clinical factors

  • A. Ali (a1), G. Ambler (a2), A. Strydom (a1), D. Rai (a3), C. Cooper (a1), S. McManus (a4), S. Weich (a5), H. Meltzer (a6), S. Dein (a1) and A. Hassiotis (a1)...



Happiness and higher intelligent quotient (IQ) are independently related to positive health outcomes. However, there are inconsistent reports about the relationship between IQ and happiness. The aim was to examine the association between IQ and happiness and whether it is mediated by social and clinical factors.


The authors analysed data from the 2007 Adult Psychiatric Morbidity Survey in England. The participants were adults aged 16 years or over, living in private households in 2007. Data from 6870 participants were included in the study. Happiness was measured using a validated question on a three-point scale. Verbal IQ was estimated using the National Adult Reading Test and both categorical and continuous IQ was analysed.


Happiness is significantly associated with IQ. Those in the lowest IQ range (70–99) reported the lowest levels of happiness compared with the highest IQ group (120–129). Mediation analysis using the continuous IQ variable found dependency in activities of daily living, income, health and neurotic symptoms were strong mediators of the relationship, as they reduced the association between happiness and IQ by 50%.


Those with lower IQ are less happy than those with higher IQ. Interventions that target modifiable variables such as income (e.g. through enhancing education and employment opportunities) and neurotic symptoms (e.g. through better detection of mental health problems) may improve levels of happiness in the lower IQ groups.

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Corresponding author

*Address for correspondence: A. Ali, Department of Mental Health Sciences, University College London, 2nd Floor Charles Bell House, 67–73 Riding House Street, London W1W 7EY, UK. (Email:


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Abdel-Khalek, AM (2006). Measuring happiness with a single item scale. Social Behavior and Personality 34, 139150.
Angner, E, Ray, MN, Saag, KG, Allison, JJ (2009). Health and happiness among older adults: a community based study. Journal of Health Psychology 14, 503512.
Baron, RM, Kenny, DA (1986). The moderator-mediator variable distinction in social psychological research: conceptual, strategic and statistical considerations. Journal of Personality and Social Psychology 51, 11731182.
Baron-Epel, O (2004). Self-reported health. In Encyclopedia of Health and Behavior (ed. Anderson, N. B.), pp. 714719. Sage: Thousand Oaks, CA.
Batty, DG, Der, G, Macintyre, S, Deary, IJ (2006). Does IQ explain socioeconomic inequalities in health? Evidence from a population based cohort study in the west of Scotland. British Medical Journal 332, 580584.
Bok, D (2010). The Politics of Happiness: What Governments Can Learn from the New Research on Wellbeing. Princeton University Press: Princeton, NJ.
Bray, DW, Howard, A (1980). Career success and life satisfactions of middle aged managers. In Competence and Coping During Adulthood(ed. Bond, L. A. and Rosen, J. C.), pp. 258287. University Press of New England: Hanover, NH.
Brewin, CR, Wing, JK (1989). Manual of the MRC Needs for Care Assessment. MRC Social Psychiatry Unit, Institute of Psychiatry: London.
Brugha, TS, Bebbington, PE, Tennant, C, Hurry, J (1985). The list of threatening experiences: a subset of the 12 life events categories with considerable long term contextual threat. Psychological Medicine 15, 189194.
Brugha, TS, Morgan, Z, Bebbington, P, Jenkins, R, Lewis, G, Farrell, M, Meltzer, H (2003). Social support networks and type of neurotic symptom among adults in British households. Psychological Medicine 33, 307318.
Calvin, MC, Deary, IJ, Fenton, C, Roberts, BA, Der, G, Leckenby, N, Batty, D (2011). Intelligence in youth and all-cause-mortality: systematic review with meta-analysis. International Journal of Epidemiology 40, 626644.
Campbell, FA, Ramey, CT, Pungello, EP, Sparling, J, Miller-Johnson, S (2002). Early childhood education: young adult outcomes from the Abecedarian Project. Applied Developmental Science 6, 4257.
Chan, YK, Lee, RPL (2006). Network size, social support and happiness in later life: a comparative study of Beijing and Hong Kong. Journal of Happiness Studies 7, 87112.
Childa, Y, Steptoe, A (2008). Positive psychological wellbeing and mortality: a quantitative review of prospective observational studies. Psychosomatic Medicine 70, 741756.
Cooper, C, Bebbington, P, King, M, Jenkins, R, Farrell, M, Brugha, T, McManus, S, Stewart, R, Livingston, G (2011 a). Happiness across age groups: results from the 2007 National Psychiatric Morbidity Survey. International Journal of Geriatric Psychiatry 26, 608614.
Cooper, C, Bebbington, P, Livingston, G (2011 b). Cognitive impairment and happiness in old people in low and middle income countries: results of the 10/66 study. Journal of Affective Disorders 130, 198204.
Crawford, JR, Besson, JAO, Parker, DM, Sutherland, KM, Keen, PL (1987). Estimation of premorbid intellectual status in depression. British Journal of Clinical Psychology 26, 313314.
Crawford, JR, Parker, DM, Besson, JAO (1988). Estimation of premorbid intelligence in organic conditions. British Journal of Psychiatry 153, 178181.
Deary, IJ, Strand, S, Smith, P, Fernandes, C (2007). Intelligence and educational achievement. Intelligence 35, 1321.
Diener, E, Oishi, S (2004). Are Scandinavians happier than Asians? Issues on comparing nations on subjective wellbeing. In Asian Economic and Political issues, 10th edn(ed. Columbus, F.), pp. 125. Nova Science: Hauppauge, NY.
Efron, B, Tibshirani, RJ (1994). An Introduction to the Bootstrap. Chapman and Hall, CRC Press LLC: Boca Raton, FL.
Emerson, E, Einfeld, S, Stancliff, RJ (2010). The mental health of young children with intellectual disabilities or borderline intellectual functioning. Social Psychiatry and Psychiatric Epidemiology 45, 579587.
Gale, CR, Hatch, SL, Batty, GD, Dreary, IJ (2009). Intelligence in childhood and risk of psychological distress in child hood: the 1958 National Child Development Survey and the 1970 British cohort study. Intelligence 37, 592599.
Gallup, G (1976). Human needs and satisfactions: a global survey. Public Opinion Quarterly 40, 459467.
Gottfredson, S, Deary, IJ (2004). Intelligence predicts health and longevity, but why? Current Directions in Psychological Science 13, 14.
Gow, AJ, Whiteman, MC, Pattie, A, Whalley, L, Starr, J, Deary, IJ (2005). Lifetime intellectual function and satisfaction with life in old age: longitudinal cohort study. British Medical Journal 331, 141142.
Graney, MJ (1975). Happiness and social participation in aging. Journal of Gerontology 30, 701706.
Hassiotis, A, Strydom, A, Hall, I, Ali, A, Lawrence-Smith, G, Meltzer, H, Head, J, Bebbington, P (2008). Psychiatric morbidity and social functioning among adults with borderline intelligence living in private households. Journal of Intellectual Disability Research 52, 95106.
Hassiotis, A, Tanzarella, M, Bebbington, P, Cooper, C (2011). Prevalence and predictors of suicidal behaviour in a sample of adults with estimated borderline intellectual functioning: results from a population survey. Journal of Affective Disorders 129, 380384.
Idler, EL, Benyamini, Y (1997). Self-rated health and mortality: a review of twenty seven community studies. Journal of Health and Social Behavior 38, 2137.
Jenkins, R, Meltzer, H, Bebbington, P, Brugha, T, Farrell, M, McManus, S, Singleton, N (2009). The British Mental Health Survey Programme: achievements and latest findings. Social Psychiatry and Psychiatric Epidemiology 44, 899904.
Jorm, AF, Duncan-Jones, P (1990). Neurotic symptoms and subjective well-being in a community sample: different sides of the same coin? Psychological Medicine 20, 647654.
Kahneman, D, Diener, E, Schwarz, N (1999). Wellbeing: The Foundations of Hedonic Psychology. Russell Sage Foundation Publications: New York.
Kashdan, TB, Biswas-Diener, R, King, LA (2008). Reconsidering happiness. The costs of distinguishing between hedonics and eudaimonia. Journal of Positive Psychology 3, 219233.
Kurland, BF, Gill, TM, Patrick, DL, Larson, EB, Phelan, EA (2006). Longitudinal change in positive affect in community dwellings in older persons. Journal of the American Geriatric Society 54, 18461853.
Lewis, G, Pelosi, AJ, Araya, R, Dunn, G (1992). Measuring psychiatric disorder in the community: a standardized assessment for use by lay interviewers. Psychological Medicine 22, 465486.
Lundberg, O, Manderbacka, K (1996). Assessing reliability of a measure of self-rated health. Scandinavian Journal of Social Medicine 24, 218224.
McManus, S, Meltzer, H, Brugha, T, Bebbington, P, Jenkins, R (editors) (2009). Adult Psychiatric Morbidity in England, 2007. Results of a Household Survey. NHS Information Centre for Health and Social Care: Leeds.
O'Carroll, R, Walker, M, Dunan, J, Murray, C, Blackwood, D, Ebmeier, KP, Goodwin, GM (1992). Selecting controls for schizophrenia research studies: the use of the National Adult Reading Test (NART) is a measure of premorbid ability. Schizophrenia Research 8, 137141.
Palmore, EB, Luikart, C (1972). Health and social factors related to life satisfaction. Journal of Health and Social Behavior 13, 6880.
Schmidt, F, Hunter, J (2004). General mental ability in the world of work: occupational attainment and job performance. Journal of Personality and Social Psychology 86, 162173.
Seligman, MEP, Steen, TA, Park, N, Peterson, C (2005). Positive psychology progress. Empirical validation of interventions. American Psychologist 60, 410421.
Seltzer, MM, Floyd, F, Greenberg, J, Lounds, J, Lindstrom, M, Hong, J (2005). Life course impacts of mild intellectual deficits. American Journal of Mental Retardation 110, 451468.
Sigelman, L (1981). Is ignorance bliss? A reconsideration of the folk wisdom. Human Relations 34, 965974.
Steptoe, A, Dockray, S, Wardle, J (2009). Positive affect and psychobiological processes relevant to health. Journal of Personality 77, 17471776.
Subramanian, SV, Kim, D, Kawachi, I (2005). Covariation in the socioeconomic determinants of self rated health and happiness: a multivariate multilevel analysis of individuals and communities in the USA. Journal of Epidemiology and Community Health 59, 664669.
Washburne, JN (1941). Factors related to the social adjustment of college girls. Journal of Social Psychology 13, 281289.
Waterman, AS (1993). Two conceptions of happiness: contrasts of personal expressiveness (eudaimonia) and hedonic enjoyment. Journal of Personality and Social Psychology 64, 678691.
Watten, RG, Myhrer, T, Swersen, JL (1995). Quality of life, intelligence and mood. Social Indicators Research 36, 287299.
Weich, S, Brugha, T, King, M, McManus, S, Bebbington, P, Jenkins, R, Cooper, C, McBride, O, Stewart-Brown, S (2011). Mental well-being and mental illness: findings from the Adult Psychiatric Morbidity Survey for England 2007. British Journal of Psychiatry 199, 2328.
Wessman, AE, Ricks, DF (1966). Mood and Personality. Holt: New York.


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